Want to slow car down...

OK Here goes....

i converted my funny car to an altered.

Current set up -
542ci Hemi, brad fuel heads, littlefield 14/71 HH delta older style.
Crane R-296/500-16
Enderle 1100 pump
11.3 to 1 compression ratio.
Hays steel 3 disk
Lenco 3sp 1.92 low
4:30 gear.

Car runs 6.40 - 6.50's. (although the motor has gone as quick as 6.07)

I want to run 7.0's or so (7.0 pro, top dragster).
Any thoughts on what the car would run if I ditched the blower and went FI only.

Also, considering swapping the lenco for a powerglide.

What other changes would need to be made? Compression ratio? cam? to make this run good (reliable) and be relatively low maintenance?
Am i barking up the wrong tree entirely?
Honestly i dont know if this is dumb idea or if anyone has done this (seemingly going backwards).

If there are many changes to the motor to get this setup working i may look in a different direction but i'd like some opinions.

Thanks

 

Hemi for chevy

I'll trade ya a blown and injected sbc and you can go 7:O'S ALL DAY LONG

 

slow down

less compression, less fuel, less boost = less power. my 2 cents, that would slow it right down.

Mark

 

Hey ive been thinking of selling the car and building an injected bbc or sbc fed
But, before i go that route, i want to read about how dumb i am

 

I don't think it's so dumb but I would look at continuing with what you are familiar with.
Seems the better course than following the Chevy crowd and starting over from scratch.
I will start.
Keep the Lenco unless rules say a 2 speed but even then I would keep the lenco.

Dave Koehler
http://www.koehlerinjection.com

 

I dont think you want injected, then you might have a hard time hitting the number. Slow the blower down to about 20 percent, install a pump loop or get a smaller pump so you are at about 10 gallons per minute (to start, might need to go down to 9 gpm), put as little timing in as possible (about 30 with a Mallory, 23 with an MSD 44), and put a little thicker head gasket in to get down to about 11 to 1. You should be close.

 

I would say Ken is correct! maybe 10 to 1 with 9 or 10 gallons then it wont pollute the oil at all.

 

Thanks for all the advice guys. So if i change the pump, comp ratio and blower overdrive how would that relate to the nozzles and jets i currently have set up.
Here is what the setup is on the car right now, the fuel system was flowed by Jimmy Rector...

this setup burns the cad about 3/4 around the base of the plugs.

Hat Nozzles
1. .060 2. .060
3. .058 4. .058
5. .056 6. .056
7. .060 8. .060 <--These to back of blower

Port Nozzles
1. .070 2. .065
3. .060 4. .059
5. .056 6. .060
7. .055 8. .058

Idle check 8 lbs
Port check 12 lbs
Pump Saver 155 lbs
High Speed 55 lbs
Barrel Valve 82%
Main Jet 100

I currently have a Barn door buzzard catcher, should I go to a bird catcher?

I'm not looking for specific numbers but with the changes made described above around what total area would i be looking for and would all the check valves remain the same with the new setup? I'm just trying to get my head around this.

 

7 flat in poor air on that engine without a blower will be much harder than you can imagine. Be lots easier to take blower and timing out of it.

 

Well this should be easy....here goes - more fuel, less compression, less timing, more weight, shift lower, more wing/wicker attack, trans ratio, rear end ratio....lots and lots of things you can do to slow it down; I'd take a look at the most economical and go from there. Realistically with a supercharger you can get a throttle controller and only open the blades 3/4 or so, or put a solid pedal stop in it. That is cheap, easy, and wont hurt anything aside from et; this way if you get into sub-par conditions you can adjust the throttle stop/pedal stop for more e.t..

Brandon Booher
NHRA TAD #34

 

Several years ago I was helping out on a blown alcohol funny car that ran in CIFCA (7.50 Index) and a 6.30 class. 518 CI fuel headed hemi, Std helix 14-71, 15.5 GPM pump, glide type clutch, 3 speed Lenco, 4.30 gear. We did a test and tune one day with 18% underdrive and about 26 degrees of timing and it ran a couple easy 7.50 full passes. That same afternoon we switched pulleys around to around 30% overdrive and it ran a 6.70 something with no other changes. Added a couple degrees of timing and a little more blower OD and it ran a 6.60. 4 Passes in the same day. Blower speed and timing, It doesn't get much easier than that.

 

Your hat nozzles are probably too big, I would change them to 52s to get the fuel pressure back up and not flood the motor. Ports look ok

 

oh, and the pump saver should be close to 200 psi, just to make sure it doesnt open at the wrong time.

 

Thanks for all the replies from everyone. I appreciate it.

 

Blower speed, timing and getting compression down gives you a lot wider tuning window for hitting the index. I'm running about 10.75, with a little more overdrive than has been recocommended, mainly because I havn't restripped in 4 years and between 24-27 degrees on a 5 amp Mag4. Ran 7.03 and 7.02 in first and second round of last NDRL race, pulled the pan off last year for first time in 2 years, just put it right back on. Basically plugs set valves and occasional oil change. You've got the pieces you need, just a matter of getting the right adjustments.....